Question 52287
15X+12(12,000-X)=165000 OR 15X+144000-12X=165000 OR 3X=165000-144000 OR 

3X=21000 OR X=21000/3 OR X=7000 SHARES @ $15  & 12000-7000=5000 @ $12

PROOF 7000*15+5000*12=165000 OR 105000+60000=165000 OR 165000=165000